The world has plunged into chaos, experimentation with a man made virus went wrong one day slowly infecting the world turning almost every living being into some mutated beast, the government sent the most important people into space with experimental cloning equipment and a selected amount of DNA. The idea was to hopefully return to earth with an army, eradicate this virus and re-populate the earth. Shortly after we left earth fell silent, we have no idea whats down there marine and its your job to find out.